Fixed variable lifetime in loops

src/build/core/CompileCall.go

@@ -51,6 +51,10 @@ func (f *Function) CompileCall(root *expression.Expression) error {
 		f.Call(funcName)
 	}
 
+	for _, register := range registers {
+		f.Scope().Free(register)
+	}
+
 	// Pop
 	for i := len(f.cpu.General) - 1; i >= 0; i-- {
 		register := f.cpu.General[i]